Express + MongoDB 实现文件上传

yqcoder2025-03-01 16:04

使用 `multer` 中间件来处理文件上传，同时将文件的元数据存储到 MongoDB 中。

一、安装依赖

bash 复制代码

npm install multer

二、核心代码

javascript 复制代码

// 定义文件模型

const fileSchema = new mongoose.Schema({

  originalname: String,

  mimetype: String,

  size: Number,

  path: String,

});

const File = mongoose.model("File", fileSchema);

// 配置 multer

const storage = multer.diskStorage({

  destination: function (req, file, cb) {

    cb(null, "uploads/");

  },

  filename: function (req, file, cb) {

    cb(null, Date.now() + path.extname(file.originalname));

  },

});

const upload = multer({ storage: storage });

// 创建上传目录

const fs = require("fs");

if (!fs.existsSync("uploads")) {

  fs.mkdirSync("uploads");

}

// 处理文件上传

app.post("/upload", upload.single("file"), async (req, res) => {

  try {

    const { originalname, mimetype, size, path } = req.file;

    const newFile = new File({

      originalname,

      mimetype,

      size,

      path,

    });

    await newFile.save();

    res.status(200).json({ message: "文件上传成功", file: newFile });

  } catch (error) {

    res.status(500).json({ message: "文件上传失败", error: error.message });

  }

});